Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4ac91ecb1e6545…

MALICIOUS

PDF

119.5 KB Created: 2021-03-30 23:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7853e918ffd5a0a209d58fa5ee3812ce SHA-1: 58a42d1570f3d0c1386cb4596487538b030a6ea2 SHA-256: 9e4ac91ecb1e654514c02384fc7e40fd7b756d657d7ec79c2b508d29d636c730
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to direct users to potentially malicious content. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ClamAV detection and ML classifier further support its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=mmea+conference+2020+michigan In PDF document text
    • http://lnstagram-helps-contact.com/death_note_movie_2017_box_officeycgus.pdfIn PDF document text
    • https://varigero.weebly.com/uploads/1/3/4/4/134443598/7595b.pdfIn PDF document text
    • https://cdn.sqhk.co/vupapevixu/9liehaU/pictures_of_all_over_the_world_flags.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd10a00b3ea3.pdfIn PDF document text
    • http://mini-camera-super.club/zejadatunobuz910s.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/gegISxD/jaruronemeseruralowugis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_5fe8c01699435.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/5a95ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/neliwuwo/hj9rgcH/wokavodiver.pdfIn PDF document text
    • https://dubevatuw.weebly.com/uploads/1/3/0/9/130969539/muzexajudejal-senas-disoxonusesapop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494883/normal_5fe4c28d7b526.pdfIn PDF document text
    • https://furimulu.weebly.com/uploads/1/3/1/4/131411024/2583112.pdfIn PDF document text
    • http://thrivewebs.com/wamomijifiluwidux9y9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_60534d1f1f198.pdfIn PDF document text
    • http://insurancecarusa.com/english_armenian_dictionary_free_download_for_windows_10wm7r6.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/je0gdha/how_many_levels_are_in_cube_surfer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/batiku/linen_sheet_set_bed_bath_and_beyond.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_9d7e4e5d98fe463c94dd293f551cc77f.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_84fa1d0d5197459db1b26783bc796a5c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/86811536539.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_573df178b85a44d0b468735889fb1250.pdf?index=trueIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_b566e602467e4a5d90fd324d56b82d2c.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_14ed79913c9b4545a8d64a097ef378c1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xelimewat/19845271589.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000195a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195A7 5364 bytes
SHA-256: 0f88c26d34d25f6477f1ba60a37d9444df734e0228717ef4ae935ece3fa8af56
font_01_sfnt_off0001a7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7C5 12200 bytes
SHA-256: 8bc420b75bf72cf9a71e35dda274372103374392617862002c4dabed76fad63c